Anti-collagen, type IV, alpha 3 (Goodpasture antigen) antibodies enable researchers to detect and measure the collagen, type IV, alpha 3 (Goodpasture antigen) antigen in biological samples. This target is a reported synonym of the COL4A3 gene, which encodes collagen type IV alpha 3 chain. This protein is known to function in the apoptotic pathway and cell adhesion, among other biological roles. The human version of collagen, type IV, alpha 3 (Goodpasture antigen) has a canonical amino acid length of 1670 residues and a protein mass of 161.8 kilodaltons, although 5 isoforms have been identified. It is reported to be localized in the extracellular matrix and is secreted of cells and notably expressed in many tissues, such as the cervix, tonsil, and appendix. Other names for this target antigen include ATS2, ATS3, and BFH2.